Hi, I would like to submit a libvirt based stonith plugin for review and possible inclusion to glue. The plugin uses the client of libvirtd (i.e. virsh) _in the virtual machines_ and connects remotely to libvirtd on the hypervisor. Therefore is works with whatever transport or hypervisor that libvirt supports or will support.
Thanx Holger #!/bin/sh # # External STONITH module for a libvirt managed hypervisor (kvm/Xen). # Uses libvirt as a STONITH device to control guest. # # Copyright (c) 2010 Holger Teutsch <[email protected]> # # This program is free software; you can redistribute it and/or modify # it under the terms of version 2 of the GNU General Public License as # published by the Free Software Foundation. # # This program is distributed in the hope that it would be useful, but # WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. # # Further, this software is distributed without any warranty that it is # free of the rightful claim of any third person regarding infringement # or the like. Any license provided herein, whether implied or # otherwise, applies only to this software file. Patent licenses, if # any, provided herein do not apply to combinations of this program with # other software, or any other product whatsoever. # # You should have received a copy of the GNU General Public License # along with this program; if not, write the Free Software Foundation, Inc., # 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. # # start a domain libvirt_start() { out=$($VIRSH -c $hypervisor_uri start $domain_id 2>&1) if [ $? -eq 0 ] then ha_log.sh notice "Domain $domain_id was started" return 0 fi if echo "$out" | grep -i 'Domain is already active' > /dev/null 2>&1 then ha_log.sh notice "Domain $domain_id is already active" return 0 fi ha_log.sh err "Failed to start domain $domain_id" ha_log.sh err "$out" return 1 } # stop a domain # return # 0: success # 1: error # 2: was already stopped libvirt_stop() { out=$($VIRSH -c $hypervisor_uri destroy $domain_id 2>&1) if [ $? -eq 0 ] then ha_log.sh notice "Domain $domain_id was stopped" return 0 fi if echo "$out" | grep -i 'domain is not running' > /dev/null 2>&1 then ha_log.sh notice "Domain $domain_id is already stopped" return 2 fi ha_log.sh err "Failed to stop domain $domain_id" ha_log.sh err "$out" return 1 } # get status of stonith device (*NOT* of the domain). # If we can retrieve the status of the domain at issue from the hypervisor # the stonith device is OK. libvirt_status() { out=$($VIRSH -c $hypervisor_uri domstate $domain_id 2>&1) if [ $? -eq 0 ] then ha_log.sh notice "$hypervisor_uri/$domain_id: $out" return 0 fi ha_log.sh err "Failed to get status for $domain_id" ha_log.sh err "$out" return 1 } # check config and set variables # does not return on error libvirt_check_config() { VIRSH=`which virsh 2>/dev/null` if [ ! -x "$VIRSH" ] then ha_log.sh err "virsh not installed" exit 1 fi if [ -z "$hostname" -o -z "$hypervisor_uri" ] then ha_log.sh err "hostname or hypervisor_uri missing; check configuration" exit 1 fi # default domain_id to hostname : ${domain_id:=$hostname} } libvirt_info() { cat << LVIRTXML <parameters> <parameter name="hostname" unique="1" required="1"> <content type="string" /> <shortdesc lang="en"> Hostname </shortdesc> <longdesc lang="en"> Name of the controlled node. </longdesc> </parameter> <parameter name="domain_id" unique="1"> <content type="string" /> <shortdesc lang="en"> Domain-id if the of the host. </shortdesc> <longdesc lang="en"> Domain-id of the host's virtual machine. Defaults to parameter hostname. </longdesc> </parameter> <parameter name="hypervisor_uri" required="1"> <content type="string" /> <shortdesc lang="en"> Hypervisor URI </shortdesc> <longdesc lang="en"> URI for connection to the hypervisor. driver[+transport]://[usern...@][hostname][:port]/[path][?extraparameters] e.g. qemu+ssh://my_kvm_server.mydomain.my/system (uses ssh for root) xen://my_kvm_server.mydomain.my/ (uses TLS for client) virsh must be installed (e.g. libvir-client package) and access control must be configured for your selected URI. </longdesc> </parameter> </parameters> LVIRTXML exit 0 } ############# # Main code # ############# # don't fool yourself when testing with stonith(8) # and transport ssh unset SSH_AUTH_SOCK case $1 in gethosts) echo $hostname exit 0 ;; on) libvirt_check_config libvirt_start exit $? ;; off) libvirt_check_config libvirt_stop [ $? = 1 ] && exit 1 exit 0 ;; reset) # libvirt has no reset so we do power down # and power on (but only if it was before) libvirt_check_config libvirt_stop rc=$? [ $rc = 1 ] && exit 1 [ $rc = 2 ] && exit 0 sleep 2 libvirt_start exit $? ;; status) libvirt_check_config libvirt_status exit $? ;; getconfignames) echo "hostname hypervisor_uri" exit 0 ;; getinfo-devid) echo "libvirt STONITH device" exit 0 ;; getinfo-devname) echo "libvirt STONITH external device" exit 0 ;; getinfo-devdescr) echo "libvirt-based Linux host reset for Xen/KVM guest domain through hypervisor" exit 0 ;; getinfo-devurl) echo "ihttp://libvirt.org/uri.html http://linux-ha.org/wiki"; exit 0 ;; getinfo-xml) libvirt_info echo 0; ;; *) exit 1 ;; esac _______________________________________________________ Linux-HA-Dev: [email protected] http://lists.linux-ha.org/mailman/listinfo/linux-ha-dev Home Page: http://linux-ha.org/
